Mount Haruna (榛名山, Haruna-san) is a dormant stratovolcano in Gunma, eastern Honshū, Japan.
Mount Haruna has many peaks and the tallest one, Mount Kamonga is 1,449 m high. It appeared about 300,000 years ago and the last known eruption was c. 550. The volcano has a summit caldera containing the symmetrical cone of Mount Harunafuji, along with a crater lake, Lake Haruna, along the western side. To the west of the lake is Mount Kamonga, the tallest peak.